Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
hanh tang » hanh trang, anh tang, hanh mang
hua thong » hoa thong, hua khong, huu thong
tang hua » tang ha, tang cua, tang luan
van quan » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) OR (hieu quang)) - hanh tang hua thong duong ((van quan) or (anh tuan)) bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (hieu quang)) - hanh tang hua thong duong ((van quan) OR (anh tuan)) bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) OR (hieu quang)) - hanh tang hua thong duong ((van quan) or (anh tuan)) bac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) OR (hieu quang)) - hanh tang hua thong duong ((van quan) or (anh tuan)) bac*.